Composition tor the manufacture of artificial tiles



UNITED STATES PATENT ()FFICE.

ROBERT SKINNER, OF SAN FRANCISCO, CALIFORNIA.

COMPOSITION FOR THE MANUFACTURE OF ARTIFICIAL TILE S.

SPECIFICATION forming part of Letters Patent No. 257,093, dated April 25, 1882.

Application filed August 31, 1881.

To all whom it may concern:

Be it known that I, ROBERT SKINNER, a citizen of the United States, and residing at San Francisco in the count of San Francisco and I n i State of Cahfornia, have invented a new and useful Improvement in the Manufacture of Artificial Tiles and Flagging, of which the following is a specification.

My inventionconsists of an artificial tile or concrete paving-block which is composed of upper surface of the tile which I prefer to. use

are as follows: one part rosin, two parts sharp sand or silex of light color, one part Portland cement. The rosin is to be melted by the aid of steam and the sand and cement heated so as to become very hot, when these two latter ingredients are put into the melted rosin and the whole thoroughly mixed and incorporated by stirring.

In using the above composition I em ploy iron molds of the desired capacity or dimensions,

and these molds are surrounded by a steamjacket. The asphalt, which is to form the base of the tiles, after being melted and suitably tempered, is put into the mold first, so as to 0 form a base of any desired thickness, after which the composition of resin, sand, and cement, while in a heated condition, is placed upon the top of the asphalt and pressure applied. Steam is now admitted to the jacket surrounding the mold, and is retained therein for a few moments, when it is permitted to escape from the jacket, and a jet of cold water succeeds to (No specimens.)

the place of the steam, by which means the tile is caused to contract or shrink away from the mold and assume a hardened state with smooth faces, so that it may be easily removed from the mold and the process repeated.

By this composition and the method of treating it I provide a cheap tiling for sidewalks and for all paving purposes, and one of great induration and smoothness.

For obtaining tiles or flagging of different colors suitable pigments may be employed and incorporated with the ingredients in mixing, as above described. The lower surface of this block is made with corrugations, which are embedded in the earthy foundation when laid, and the upper surface presents a fine smooth appearance.

I am aware that compounds of sand, tar, and hydraulic cement have been used in the manufacture of tiles, and also that sand and rosin have been combined with lime, strontia, baryta or magnesia for a like purpose. These, however, I do not claim; but

What I claim as my invention is- A concrete block consisting of a base composed of asphalt or pitch suitably tempered and an upper surface composed ot'melted rosin,light sharp sand or silex, and Portland cement, constructed and united together in the manner substantially as herein set forth and specified.

In testimony that I claim the foregoing I have hereunto set my hand and seal this 22d day of August, 1881.

ROBERT SKINNER.

Witnesses:

O. W. M. SMITH, CHASJE. KELLY. 

